fix err msgs

[farazkhawaja]

Addresses review comment: #232 (comment)

Fixed error messages to follow Go best practices by starting with lowercase letters
ref: https://go.dev/wiki/CodeReviewComments#error-strings

[k8s-ci-robot]

Hi @farazkhawaja. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[rjsadow]

/ok-to-test

[farazkhawaja]

@rjsadow gentle ping

[rjsadow]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: farazkhawaja, rjsadow

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.